S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

Full text
393. A steel roof at least 4 mm (0.2 in) in thickness or one providing equivalent strength shall protect any worker on the top of a conveyance. In the case of a sinking crosshead, the roof shall be supported by the crosshead and not by the hoisting rope.
O.C. 213-93, s. 393; O.C. 782-97, s. 25.